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Sintering of hierarchically structured ZnO

Published online by Cambridge University Press:  31 January 2011

Markus König ,
Sören Höhn ,
Rudolf Hoffmann ,
Jens Suffner ,
Stefan Lauterbach ,
Ludwig Weiler ,
Olivier Guillon  and
Jürgen Rödel
Markus König*
Affiliation:
Institut für Materialwissenschaft, Technische Universität Darmstadt, 64287 Darmstadt, Germany
Sören Höhn
Affiliation:
Fraunhofer-Institut für Keramische Technologien und Systeme, IKTS Dresden, 01277 Dresden, Germany
Rudolf Hoffmann
Affiliation:
Fachbereich Chemie, Eduard Zintl-Institut, Anorganische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany
Jens Suffner
Affiliation:
Institut für Materialwissenschaft, Technische Universität Darmstadt, 64287 Darmstadt, Germany
Stefan Lauterbach
Affiliation:
Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, 64287 Darmstadt, Germany
Ludwig Weiler
Affiliation:
Institut für Materialwissenschaft, Technische Universität Darmstadt, 64287 Darmstadt, Germany
Olivier Guillon
Affiliation:
Institut für Materialwissenschaft, Technische Universität Darmstadt, 64287 Darmstadt, Germany
Jürgen Rödel
Affiliation:
Institut für Materialwissenschaft, Technische Universität Darmstadt, 64287 Darmstadt, Germany
*
a)Address all correspondence to this author. e-mail: koenig@ceramics.tu-darmstadt.de
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Abstract

Hierarchically structured zinc oxide was prepared from zinc acetylacetonate by a microwave-assisted process. The zinc oxide formed nanoparticles that are packed in substructured spherical agglomerates with a diameter of 0.5 μm. Nitrogen adsorption, x-ray diffraction, and dilatometry were used to investigate the densification. Ion beam method was applied to prepare cross sections and enable microstructural analysis. Three regimes of microstructural evolution were identified on different scales during sintering. In the first regime, nanoparticles changed morphology and densification occurred only in the interiors of the agglomerates. In the second regime, agglomerates became hollow and built necks. Simultaneously, densification set in on the macroscopic scale. A drastic homogenization of the microstructure was observed that marked the beginning of the third regime, where densification and grain growth occurred.

Keywords

DensificationMicrostructureNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 11 , November 2010 , pp. 2125 - 2134
Copyright
Copyright © Materials Research Society 2010

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